Well, one of them now works at Facebook, another at Google, another at Amazon. The youngest one is still at a smaller company but I suspect he'll end up finding a job at a Big Five or some such.

To answer your question, they get swallowed. Google etc hoard talent, and those that can fake it. I don't know if that's good, but they definitely end up with resources to produce incredible things. Then again what would they do alone, I wonder.